Guangdong Weirui Intelligent Equipment Co., Ltd
What is the working principle of a center-seam folding machine?
Release Date:
2026-01-28
The core principle of a center-seam laminating machine is to precisely align two or more layers of flexible roll stock along the central axis, then continuously and securely laminate them at the seam through adhesive bonding, heat pressing, or ultrasonic welding. The equipment first uses an unwinding mechanism to synchronously feed fabrics, nonwovens, films, and other roll materials. A centering and deviation-correction unit ensures that the materials remain centered at all times, preventing any lateral shift. The material then enters the lamination station: for hot-melt adhesive processes, adhesive is precisely applied at the center seam; for heat-pressing or ultrasonic processes, high-temperature rollers or high-frequency vibrations are used directly to melt and bond the contacting surfaces. After lamination, the composite material is conveyed forward at a constant speed by a traction device, followed by shaping and cooling via pressure rollers to ensure a smooth, strong, wrinkle-free, and crack-free seam. Finally, a rewinding mechanism collects the finished laminated roll. The entire process is continuous and automated, relying on precise centering, stable material supply, and controllable adhesive pressure and temperature to achieve high-strength, high-sealability continuous lamination at the center seam. This technology is primarily used for center-seam bonding in hygiene products, packaging, waterproof membranes, and similar applications.
The core principle of a center-seam laminating machine is to precisely align two or more layers of flexible roll stock along the central axis, followed by continuous, robust lamination and formation at the central seam through adhesion, heat pressing, or ultrasonic bonding.
The equipment first uses an unwinding mechanism to synchronously feed roll materials such as fabric, nonwoven fabric, and film. A centering and deviation-correction device ensures that these materials remain precisely centered at all times, thereby preventing any lateral drift. The material then proceeds to the lamination station: for hot-melt adhesive processes, adhesive is accurately applied along the center seam; for thermal pressing or ultrasonic bonding, high-temperature rollers or high-frequency vibration are used directly to melt and bond the contacting surfaces.
The laminated material is conveyed forward at a constant speed by a traction device, then shaped and cooled by pressure rollers to ensure that the seam is smooth, secure, wrinkle-free, and crack-free. Finally, a winding mechanism collects the material into finished rolls. The entire process is continuous and fully automated, relying on precise web centering, stable material supply, and controllable adhesive pressure and temperature to achieve high-strength, high-sealability continuous lamination at the center seam. This process is primarily used for center-seam bonding in products such as hygiene articles, packaging materials, and waterproof membranes.
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